I feel that in usage, lyrical is the 'soft jazz' that is always done to sad, angsty, nostalgic or sweet songs. In usage, 'contemporary' usually means 'modern jazz' or 'new jazz' that is done to more of a variety of music.
The greatest integer function of a real number x is represented by f(x) = [x] or |_x_|. For all real numbers x, the greatest integer function returns the largest integer less than or equal to x. In other words, the greatest integer function rounds down a real number to the nearest integer.
Floor Function. The floor function, also called the greatest integer function or integer value (Spanier and Oldham 1987), gives the largest integer less than or equal to. The name and symbol for the floor function were coined by K. E. Iverson (Graham et al. 1994).